{#
  ctoon-nav.html — sidebar navigation
  Uses Sphinx toctree() — works when toctree is not :hidden:
#}
{%- set nav = toctree(maxdepth=1, titles_only=True, collapse=False) %}
{%- if nav %}
{{ nav }}
{%- else %}
<ul>
    <li class="{{ 'current' if pagename == master_doc else '' }}">
        <a href="{{ pathto(master_doc) }}">Overview</a>
    </li>
</ul>
{%- endif %}